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Financial instruments (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Recurring |  |
Net liability arising from put/call options | $ 664,000 | $ 0
Net asset arising from put/call options | 0 | 24,000
Fair Value, Inputs, Level 1 [Member] |  |
Recurring |  |
Net liability arising from put/call options | 0 |
Net asset arising from put/call options |  | 0
Fair Value, Inputs, Level 2 [Member] |  |
Recurring |  |
Net liability arising from put/call options | 0 |
Net asset arising from put/call options |  | 0
Fair Value, Inputs, Level 3 [Member] |  |
Recurring |  |
Net liability arising from put/call options | $ 664,000 |
Net asset arising from put/call options |  | $ 24,000

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